I have a problem that may be down to OpenLayers or to Mapserver, or (just as likely) to me. Basically I am using OL to request WMS maps from Mapserver, and the map consists of point features with a global spread, typically around 100 points in each map. The points are defined in a table which has lat/lon in decimal degrees, and these are converted to 900913 by Mapserver where my mapfile has an overall projection of epsg: 900913 but the points layer has projection epsg: 4326.

The map is defined in OL with extents: -20037508.34, -20037508.34, 20037508.34, 20037508.34 and the mapfile has the same extents applied.

This all works fine when a map is first displayed, all of the points are present on the map. However when I scroll the map left or right there is a ‘dead spot’ where  all the points in North America disappear and then re-appear, either side of the dead spot. Looking with Firebug at the bounding box that OL uses to request the map from Mapserver I can see that the points disappear when the bounding box is between left bounds of about -23700000 and -33700000. Only the points in North America are affected, never those in Europe or Asia.

I have been wrestling with this for quite a while, experimenting with extents etc, all without any effect.  Does anyone recognise where my problem may lie, or else have any suggestions how to diagnose what is going on?

Chris  

Hi Jerl

Eurueka! “+over” did it!

Thanks, I owe you one.

Chris

Chris:

Dear All,

I am a newbie of mapserver and other online mapping technologies. Recently, I have been struggling to load a TinyOWS WFS Layer to an OpenLayers map.  I set up proxy.cgi, which works fine. I checked TinyOWS using command “tinyows –check”, which also seems to be working. The page http://.../cgi-bin/tinyows.exe?service=wfs&request=getCapabilities&version=1.1.0&typename=tows:lrtstops doesn’t return any error either.  I can also load a mapserver WMS layer into the OpenLayers Map with no problem. However, no feature from the WFS layer would show in the OpenLayers map.  Since both the WMS and WFS layers are of the same projection, which is EPSG:2227, I assume that the misspecification of projection is not likely to be the caprice here.   The following is the JavaScript I used and the response returned. Could someone help me find out what I did wrong? Many thanks in advance!

OpenLayers.ProxyHost = "/fcgi-bin/proxy.cgi?url=";

function init() {

     map = new OpenLayers.Map('map', {

        projection: new OpenLayers.Projection("EPSG:2227"),

        units: "feet",

        maxResolution: "auto",

        maxExtent: new OpenLayers.Bounds(6103631,1911230,6186389,1976404),

        controls: [

            new OpenLayers.Control.PanZoom()

        ]

    });

    var wms= new OpenLayers.Layer.WMS(

        "parcel",

               "http://.../cgi-bin/mapserv.fcgi?MAP=.../Parcel.map",

        {layers: 'Parcel', format: 'image/jpeg'}

               );

    var wfs = new OpenLayers.Layer.Vector("Editable Features", {

        strategies: [new OpenLayers.Strategy.BBOX(), saveStrategy],

        projection: new OpenLayers.Projection("EPSG:2227"),

        protocol: new OpenLayers.Protocol.WFS({

            version: "1.1.0",

            srsName: "urn:ogc:def:crs:EPSG::2227",

            url: "http://.../cgi-bin/tinyows.fcgi",

            featureNS :  "http://roappdev1:8080/",

            featureType: "lrtstops",

            geometryName: "the_geom",

            outputFormat: "text/xml; subtype=gml/3.1.1",

           schema: "http://.../cgi-bin/tinyows.fcgi?service=wfs&request=DescribeFeatureType&version=1.1.0&typename=tows:lrtstops"

        })

    });

    map.addLayers([wms, wfs]);

---------------------------------------------------------------------------

<ows:ExceptionReport xmlns="http://www.opengis.net/ows" xmlns:ows="http://www.opengis.net/ows" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/ows http://schemas.opengis.net/ows/1.0.0/owsExceptionReport.xsd" version="1.1.0" language="en">

<ows:Exception exceptionCode="InvalidParameterValue" locator="request">

<ows:ExceptionText>XML request isn't valid</ows:ExceptionText>

</ows:Exception>

</ows:ExceptionReport>

<wfs:GetFeature xmlns:wfs="http://www.opengis.net/wfs" service="WFS" version="1.1.0" outputFormat="text/xml; subtype=gml/3.1.1" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd http://myserver/ http://myserver/cgi-bin/tinyows.fcgi?service=wfs&amp;request=DescribeFeatureType&amp;version=1.1.0&amp;typename=tows:lrtstops" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" resultType="results"><wfs:Query typeName="feature:lrtstops" srsName="urn:ogc:def:crs:EPSG::2227" xmlns:feature="http://myserver/"><ogc:Filter xmlns:ogc="http://www.opengis.net/ogc"><ogc:BBOX><ogc:PropertyName>the_geom</ogc:PropertyName><gml:Envelope xmlns:gml="http://www.opengis.net/gml" srsName="EPSG:2227"><gml:lowerCorner>6040731.6 1878643</gml:lowerCorner><gml:upperCorner>6249288.4 2008991</gml:upperCorner></gml:Envelope></ogc:BBOX></ogc:Filter></wfs:Query></wfs:GetFeature>

Response Headers

Request Headers

By the way, I am using libxml 2.7.3 and openlayers 2.11.  The following XML information is returned from phpinfo().

xml

Regards,

Ya